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Small signal voltage measuring device and method

A voltage measurement and small signal technology, which is applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of large device measurement errors, achieve accurate measurement, and avoid interference signals or noises

Active Publication Date: 2020-05-29
长沙天恒测控技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] On the one hand, the present invention provides a small-signal voltage measurement device to solve the problem that the existing small-signal measurement device has a large measurement error due to external interference signals and the characteristics of the device itself

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  • Small signal voltage measuring device and method
  • Small signal voltage measuring device and method

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Embodiment Construction

[0035] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0036] Such as figure 1 As shown, a small-signal voltage measurement device includes an integral amplifier module 1 , a voltage divider module 3 , a voltage balance detection module 2 , and a voltage sampling and measurement module 4 .

[0037] The integral amplification module 1 is used for integral amplification to obtain the integral amplification voltage, and includes an RC integral amplifier and an inverter 5 for integrally amplifying the signal, and the inverter 5 is arranged at the output end of the integral amplifier for use in To perform 180-degree reverse adjustment on the integral amplified signal output by the integral amplifier;

[0038] The voltage divider module 3 is connected ...

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Abstract

The invention discloses a small signal voltage measuring device and method. The device comprises an integral amplification module which is used for carrying out integral amplification to obtain an integral amplification voltage, a voltage dividing module used for dividing the integral amplification voltage according to a set voltage dividing proportion to obtain a comparison voltage, a voltage balance detection module which is respectively connected with an output end of the voltage dividing module, an input end of the integral amplification module and a to-be-detected small signal circuit, and is used for inputting difference between the to-be-detected small signal voltage and the comparison voltage into the integral amplification module for integral amplification, and a voltage samplingmeasurement module which is used for acquiring the integral amplification voltage in real time, and when the difference between the to-be-measured small signal voltage and the comparison voltage reaches a set threshold, obtaining the current comparison voltage as the to-be-measured small signal voltage according to the proportion of the acquired integral amplification voltage to the partial voltage. The device is advantaged in that negative influence factors such as interference signals or noise, amplifier drift and the like can be effectively avoided so as to realize accurate measurement of small signal voltage.

Description

technical field [0001] The invention relates to the field of small-signal voltage measurement, in particular, to a small-signal voltage measurement device and method. Background technique [0002] With the rapid development of industrial automation and power electronics technology, various types of sensors have emerged. They usually convert the measured physical quantity into electrical signals in equal proportions and then connect them to the sampling system for measurement. The electrical signals are mainly voltage. In the fields of detection, measurement and calibration, it is often necessary to measure the voltage of small signals as low as mV. Such signals are very weak and are often submerged by noise or external interference signals, making data collection difficult. The conventional small-signal voltage measurement method is to amplify the signal and then measure it. Usually, an operational amplifier is used, and then an A / D converter is used to convert it into a dig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503G01R19/2509G01R19/2506
Inventor 周新华舒子奇
Owner 长沙天恒测控技术有限公司
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